Aeogel and method for manufacture thereof

a technology of aeogel and aeogel, which is applied in the field of aeogel, can solve the problems of enormous cost, affecting the realization of enormous costs, and affecting the movement of air through the void, and achieves excellent heat insulation, efficient production, and excellent heat insulation

Active Publication Date: 2013-07-25
TOKUYAMA CORP
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Benefits of technology

[0031]The method for manufacturing an aerogel of the first aspect of the present invention, in which gelation of the silica sol is caused in droplets of the W/O emulsion, enables efficient production of a globular aerogel which has an average particle size of about 1 to 20 μm, exhibits excellent heat insulation, and is suitably employed as a filler such as a core material of a vacuum heat insulator or as an additive. It is also possible to manuf

Problems solved by technology

On the other hand, since the aerogels have a very small pore size of about 10 to 100 nm, movement of the air through the voids is greatly obstructed and thermal conduction by convection is significantly inhibited.
However,

Method used

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[0136]Hereinafter, the present invention will be described in more detail based on Examples and Comparative Examples. However, the present invention is not limited to the Examples. In the Examples and the Comparative Examples below, measurement of the BET specific surface area, the pore volume by the BJH method, and the pore distribution by the BJH method was carried out using BELSORP-max manufactured by BEL Japan, Inc. Measurement of the thermal conductivity was carried out using HC-074-200 manufactured by EKO Instruments Co., Ltd. The bulk density was measured by the method (constant mass measurement method) prescribed in JIS R1628. The measurement values of the average particle size and the average circularity were obtained by image analysis of 2000 particles using an SEM image of the particles measured in secondary electron detection mode at a magnification of 1000. The average circularity was obtained by determining, by the above formula (3), circularity of each of 2000 particl...

example 4

[0146]An aerogel was obtained under the same conditions as in Example 2, except that 12 g of dichlorodimethylsilane was used in the surface hydrophobing treatment, instead of 40 g of chlorotrimethylsilane. The properties of the aerogel obtained are shown in Table 1.

example 5

[0147]An aerogel was obtained under the same conditions as in Example 2, except that 14 g of trichloromethylsilane was used as a hydrophobing agent in the surface hydrophobing treatment, instead of 40 g of chlorotrimethylsilane. The properties of the aerogel obtained are shown in Table 1.

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Abstract

An aerogel with excellent thermal insulation performance, average particle size of 1 to 20 μm and globular shape; and a method of manufacturing it efficiently, is provided. The aerogel has specific surface area by BET method of 400 to 1000 m2/g; pore volume and peak pore radius by BJH method of 3 to 8 mL/g and 10 to 30 nm, respectively; average particle size and average circularity by image analysis method of 1 to 20 μm and no less than 0.8, respectively. The method includes the steps of: preparing an aqueous silica sol; dispersing the sol into a hydrophobic solvent, thereby forming a W/O emulsion; causing gelation of the sol, thereby converting the emulsion into a dispersion of a gel; replacing water in the gel with a solvent having a small surface tension; treating the gel with a hydrophobing agent; and removing the solvent used in the solvent replacement.

Description

TECHNICAL FIELD[0001]The present invention relates to an aerogel and a method for manufacture thereof.BACKGROUND ART[0002]Aerogels are materials with high porosity and excellent heat insulation properties. Herein, the aerogels refer to solid materials with a porous structure having air as a dispersion medium, and specifically solid materials having a porosity of 60% or more. The porosity represents the amount of air contained in an apparent volume of a material by a volume percentage. Thermal conduction in a material involves solid conduction (transmission of thermal vibrations), convection, and radiation. In general, contribution of convection to thermal conduction is largest in a material having a large porosity. On the other hand, since the aerogels have a very small pore size of about 10 to 100 nm, movement of the air through the voids is greatly obstructed and thermal conduction by convection is significantly inhibited. As such, the aerogels have excellent heat insulation prope...

Claims

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Application Information

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IPC IPC(8): C01B33/16
CPCY10T428/2982C01B33/16
Inventor FUKUJU, TADAHIRONUMA, HIROSHITABATA, KAZUAKI
Owner TOKUYAMA CORP
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